Thank you very much Pavel for this letter from Slovakia (capital city : Bratislava). The little and beautiful engraved stamp is dedicated to the city of Nitra , the fifth city of Slovakia, 50 miles east from Bratislava. Could someone tell me something about the other stamp depicting a raft on a river. Many thanks for helping me!

May 16th 2011 : Thanks to Inoxi and his comment (see below) I can tell you that the stamp with a raft is depicting the river Dunajec running through Slovakia and Poland!